EVB_RT2568GQW

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EVB_RT2568GQW is evaluation boards for the RT2568GQW offline switch mode power supply (SMPS). It features an isolated flyback type SMPS design that provides 5V or 12V outputs with up to 400mA load. The EVB_RT2568GQW is ideal for applications that require low cost and high efficiency power supplies.

The RT2568GQW is an ExAR-designed flexible offline power switch designed primarily for the implementation of both zero voltage soft-start and simultaneous dual output power supply designs. This IC features a low cost, minimal component count synchronous rectified flyback topology, allowing the design of high efficiency, low noise power supplies. The evaluation board utilizes the RT2568GQW as the main power switch and features onboard control circuits, including a pair of voltage regulators, linear regulators, and bootstrapping components, to provide the voltage reference and drive requirements of the IC.

The main advantage of this architecture compared to other flyback designs is its ability to regulate multiple output voltages from a single transformer. The dual output capability means that it can be configured to give multiple output voltages with a single setup and that the power supply may need only one transformer. The evaluation board is capable of providing 5.0V/12V or 5.0V/3.3V or 5.0V/1.2V outputs from a standard 20/50W transformer and an external rectangular filter inductor.

The circuit topology of the EVB_RT2568GQW is a fixed frequency isolated flyback, which enables an efficient and accurate DC output voltage regulation for a wide range of load conditions. The control loop is designed to provide fast transient response and excellent line/load regulation. The control loop can maintain a constant output voltage and line regulation with load current up to 0.5A (maximum) for a single output. Maximum output power is up to 2W (for single output) with an input voltage range of 9V to 20V.

To ensure both safety and effective performance, the EVB_RT2568GQW features a built-in protection mechanism. It is designed with a current limiting circuit, a thermal shutdown circuit, and a soft-start circuit to provide additional safety, while also improving the system EMI performance. The evaluation board also features 2 diodes for temperature compensation, which will reduce the ambient temperature-induced oscillation peak voltage at the rectifier. Additionally, the board includes an external synchronization pin that allows it to be synchronized to other devices in the system.

In conclusion, the EVB_RT2568GQW is an ideal evaluation board for the RT2568GQW offline SMPS switch mode power supply. It is capable of providing multiple output voltages with a single transformer, offers a high efficiency design, and includes a built-in protection mechanism to ensure safety and performance. With its fast transient response and excellent line/load regulation, the EVB_RT2568GQW is suitable for a variety of applications that require a low cost and high efficiency power supply.

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